From: Sandro Santilli <strk@keybit.net>
Date: Fri, 24 Sep 2004 09:46:53 +0000 (+0000)
Subject: Added box2d->geometry cast.
X-Git-Tag: pgis_1_0_0RC1~382
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=bc45e50b228b68780ffed6e31426aaf5052e7e81;p=postgis

Added box2d->geometry cast.


git-svn-id: http://svn.osgeo.org/postgis/trunk@890 b70326c6-7e19-0410-871a-916f4a2858ee
---

diff --git a/lwgeom/lwgeom_box2dfloat4.c b/lwgeom/lwgeom_box2dfloat4.c
index 05f615a93..b9581c596 100644
--- a/lwgeom/lwgeom_box2dfloat4.c
+++ b/lwgeom/lwgeom_box2dfloat4.c
@@ -34,6 +34,7 @@ Datum BOX2DFLOAT4_ymin(PG_FUNCTION_ARGS);
 Datum BOX2DFLOAT4_xmax(PG_FUNCTION_ARGS);
 Datum BOX2DFLOAT4_ymax(PG_FUNCTION_ARGS);
 Datum BOX2DFLOAT4_combine(PG_FUNCTION_ARGS);
+Datum BOX2DFLOAT4_to_LWGEOM(PG_FUNCTION_ARGS);
 
 
 
@@ -415,3 +416,39 @@ Datum BOX2DFLOAT4_combine(PG_FUNCTION_ARGS)
 	PG_RETURN_POINTER(result);
 }
 
+PG_FUNCTION_INFO_V1(BOX2DFLOAT4_to_LWGEOM);
+Datum BOX2DFLOAT4_to_LWGEOM(PG_FUNCTION_ARGS)
+{
+	BOX2DFLOAT4 *box = (BOX2DFLOAT4 *)PG_GETARG_POINTER(0);
+	POINT2D *pts = palloc(sizeof(POINT2D)*5);
+	POINTARRAY *pa[1];
+	LWPOLY *poly;
+	int wantbbox = 0;
+	LWGEOM *result;
+	char *ser;
+
+	// Assign coordinates to POINT2D array
+	pts[0].x = box->xmin; pts[0].y = box->ymin;
+	pts[1].x = box->xmin; pts[1].y = box->ymax;
+	pts[2].x = box->xmax; pts[2].y = box->ymax;
+	pts[3].x = box->xmax; pts[3].y = box->ymin;
+	pts[4].x = box->xmin; pts[4].y = box->ymin;
+
+	// Construct point array
+	pa[0] = palloc(sizeof(POINTARRAY));
+	pa[0]->serialized_pointlist = (char *)pts;
+	pa[0]->ndims = 2;
+	pa[0]->npoints = 5;
+
+	// Construct polygon
+	poly = lwpoly_construct(2, -1, 1, pa);
+
+	// Serialize polygon
+	ser = lwpoly_serialize(poly);
+
+	// Construct LWGEOM 
+	result = LWGEOM_construct(ser, -1, wantbbox);
+	
+	PG_RETURN_POINTER(result);
+}
+
diff --git a/lwgeom/lwpostgis.sql.in b/lwgeom/lwpostgis.sql.in
index dbdb2e014..29d67754c 100644
--- a/lwgeom/lwpostgis.sql.in
+++ b/lwgeom/lwpostgis.sql.in
@@ -2698,6 +2698,11 @@ CREATEFUNCTION box3dtobox(box3d)
         AS 'SELECT box($1)'
 	LANGUAGE 'SQL' WITH (isstrict,iscachable);
 
+CREATEFUNCTION geometry(box2d)
+        RETURNS geometry
+        AS '@MODULE_FILENAME@','BOX2DFLOAT4_to_LWGEOM'
+        LANGUAGE 'C' WITH (isstrict,iscachable);
+
 CREATEFUNCTION geometry(box3d)
         RETURNS geometry
         AS '@MODULE_FILENAME@','BOX3D_to_LWGEOM'
@@ -2730,6 +2735,7 @@ CREATE CAST (geometry AS box3d) WITH FUNCTION box3d(geometry) AS IMPLICIT;
 CREATE CAST (geometry AS box) WITH FUNCTION box(geometry) AS IMPLICIT;
 CREATE CAST (box3d AS box2d) WITH FUNCTION box2d(box3d) AS IMPLICIT;
 CREATE CAST (box2d AS box3d) WITH FUNCTION box3d(box2d) AS IMPLICIT;
+CREATE CAST (box2d AS geometry) WITH FUNCTION geometry(box2d) AS IMPLICIT;
 CREATE CAST (box3d AS box) WITH FUNCTION box(box3d) AS IMPLICIT;
 CREATE CAST (box3d AS geometry) WITH FUNCTION geometry(box3d) AS IMPLICIT;
 CREATE CAST (text AS geometry) WITH FUNCTION geometry(text) AS IMPLICIT;